擬周期變化 的英文怎麼說
中文拼音 [nǐzhōuqībiànhuà]
擬周期變化
英文
quasi-periodic variation-
With the computing program, flow around the square cylinder is resolved at first, and the period of laminar flow is simulated successfully. during the period of vortex street ( re = 100 ), the periodically evolutionary phenomena of the flow behind the square cylinder can be seen
利用計算程序，本文首先對方柱繞流流動進行求解，成功模擬了方柱繞流層流階段的流動和渦街階段（ re = 100 ）方柱尾流的周期性變化現象。Combining the project instance with the use of the approximate adjustment to analyze the deformation, this paper discusses the influence of the net structure of the deformation monitoring network on stability inspection of control points
摘要討論了變形監測網的網形結構對網點穩定性檢驗結果的影響，當網中擬穩點組無法獨立構成網形時，其餘動點的位移將對擬穩點在各觀測周期間的坐標值變化產生影響，致使其點位的穩定性分析結果受到影響。We investigate finer time scale statistical properties of this traffic, including burstiness, periodicity, and synchronization. utilizing the data gathered by our simulator, we compared the results with our prediction, after that, we investigated the root cause of a specific networking traffic pattern, under various network configuration and policies. the importance of our work is not only analyzing the cause of each traffic pattern, but also providing a beneficial formal method for future research
在實驗結果的分析過程中，我們根據當前流行的網路拓撲建立了模擬路由試驗環境，特別針對lsa的突發性、周期性和同步流量的時域特徵進行了觀察，不僅探究了三種重要lsa流量的發生機理以及這些流量的變化對整體路由效率的影響，比對了我們的預測與最終的實驗結果，深入研究了統計圖表裡各種異常情況的成因和路由協議採用不同演算法和策略以後對整體路由環境的影響。Abstract : the attitude error performance of electrostatic gyro should be understood and the relevant error equations must be set up in order to ensure the navigation precision of esgm. the relation between the navigation errors and the attitude errors of gyro was derived by use of spherical triangle. the simulation results show that the temporal performances of the longitudinal and distance errors which come from the initial alignment errors are periodically variational. they also show that the longitudinal and distance errors resulted from gyro drifts are not convergent in time. thus, the effects of initial alignment errors and gyro drifts can not be neglected and must be estimated and compensated
文摘:為了保證靜電監控器的導航定位精度，需要了解靜電陀螺的姿態誤差特性，建立相應的誤差方程.本文採用球面三角形原理推導了導航定位誤差與陀螺姿態誤差的關系式.模擬結果表明，由初始定向誤差引起的經度誤差和距離誤差的時間特性是周期變化的；由陀螺漂移引起的經度誤差和距離誤差是隨時間發散的.因此，初始定向誤差和陀螺漂移的影響不能忽略，必須對其進行估計和補償In this paper, micro - cavity semiconductor laser ( mcsl ) with pillar vertical - cavity surface - emitting structure ( vcsel ) which has potential applications in optical communication and optical interconnect is theoretically analyzed, the calculation model that used to discuss the modal performance of rectangular columnar and cylinder vcsel with oxidized aperture is established by using vector field model. the numerical simulations in the case of cylinder structure show oscillating wavelength and threshold gain against inside and outside radius of laser, the layer refractive index and pair number of bragg mirror, thickness, position and oxidized material ' s refractive index of oxidized aperture, in detail. more practically, considering dos shell of laser as non - perfect one, or supposing that dos shell is separated from the laser, we can obtain more significative results
本工作以矢量場模型出發，對具有誘人應用前景的柱形垂直腔面發射結構（ vcsel ）的微腔半導體激光器（ mcsl ）進行了理論分析，建立了用於分析方柱形和圓柱形結構具有氧化孔徑層的激光器的模式特性的理論模型；對圓柱形結構情況進行了數值模擬，得到了振蕩波長、閾值增益隨激光器內外半徑、 bragg反射鏡層折射率、周期數以及氧化孔徑層厚度、位置和氧化物折射率的詳細變化規律；為使理論計算更接近實際，將外加金屬包殼視為非理想導體，或將金屬包殼與激光器結構隔開，分別對這兩種情況下的結果進行了討論。Based on these models, a main - road traffic flow model with two speeds on one dimension is designed. this model simulate the situation of one road in the city, traffic lights placed on the crossing, using the computer simulation, firstly, in the case of synchronized traffic lights, we investigated the velocity and flow of the model when the initial density, the turning probabilities, the number of the traffic lights, the green to signal ratio and the period of the signal are changed, then we have advanced some meliorate measure to traffic flow ; secondly, in the case of the traffic lights " signal update delay in turn, we found the optimal matching between the period of the signal and the delay time of the traffic lights so as to the perfect velocity and the flow of the model are attained
在此基礎上，建立了一維二速主幹道模型，該模型模擬了城市交通中一條主幹道的交通情況，在交叉口處設置紅綠燈，通過計算機模擬，首先，在交通燈信號同步更新的條件下，研究模型在改變車輛的初始密度、轉向概率、交通燈個數、紅綠燈信號的綠信比、紅綠燈信號周期等各種情況下主幹道的速度、流量的變化，根據模擬結果提出一些改善交通的有效措施；其次，在交通燈信號依次延遲更新的條件下，研究模型在參數道路長、紅綠燈綠信比、交通燈個數、車輛的初始密度給定的情況下找到紅綠燈信號周期和延遲時間的最佳匹配使得主幹道的速度、流量達到最理想的值。A computer - aided simulation used to observe the influence of changing filtration parameter on upflow rough filtration is necessary because of the long term of operation cycle
由於粗濾池的運行周期很長，故採用了計算機模擬的方式觀察運行參數變化對粗濾池的影響。An approach about the no - linear whirl dynamics behavior of elastic shaft jeffcott rotor with a transverse crack, which is supported on the unsteady and no - linear oil film, is given
裂紋轉子軸剛度變化對油膜夫穩點及油膜失穩之後轉子的運動影響不大，轉子系統作擬周期運動。Based on netomac, a software package for power system simulation, the model and algorithm of pre - dispatch schedule in generation markets, excitation system parameter setting, and power system small signal stability anaylsis are studied in this thesis. the main work is as follows : a model of pre - dispatch schedule is proposed, whose target is to minimize the market purchasing price ( mpp ) in the whole pre - dispatch period. then according to the characteristics of pre - dispatch schedule, the model of pre - dispatch schedule is simplified to minimize the mpp in each pre - dispatch time, and a three - step algorithm of pre - dispatch schedule is designed : dealing with the optimal problem in the whole period of pre - dispatch with static planning method, solving the problem of combination of machines with pr1 method, resolving problem of optimal power flow ( opf ) with modified powell method
本文基於netomac模擬軟體，以發電市場預調度計劃模型及演算法、勵磁系統參數整定和電力系統小擾動穩定性分析為研究內容，主要做了以下工作：建立了以整個預調度計劃周期內的市場購電價格最小為目標的發電市場預調度計劃模型，並根據預調度計劃問題狀態數多、變量多、混合整數、非解析的特點，將預調度計劃模型的目標函數簡化為各時段的市場清算電價最小，設計了三段式預調度演算法：用靜態規劃法求解整個預調度計劃周期內的優化問題；用優先級法求解機組組合問題；用改進的powell法求解最優潮流問題。On the basis of brief reviewing the progress of the researches about the relative fields at home and abroad, the system of economic sustainable development of huangling county was qualitatively analyzed in the thesis according to the life - cycle theory of products and industries, the theory of export guiding and the theory of economic sustainable development. and the method of systematic dynamics was applied in programming and mockingly regulating the ec onomic sustainable development of huangling, the best model for the economic sustainable development of county regions was discussed. and pointed out that the key to realizing the economic sustainable development of county regions was to suitably adjust the industrial structure, to transform the single structure into the multiple - levels and diversified structure and then to realize the recreation and substitution of advantages by developing coal industry and some non - coal industries such as agriculture and tourism that possess the regional advantages
本論文在簡要回顧國內外相關領域研究進展的基礎上，依據產業和產品的生命周期理論、出口導向理論和經濟可持續發展理論，對黃陵縣域經濟可持續發展系統進行定性分析，並運用系統動力學方法對其進行規劃與模擬調控，探討了縣域經濟可持續發展的最優模式，指出實現縣域經濟可持續發展的關鍵是適時進行產業結構調整，由單一的結構向多元化、多層次轉變，通過發展煤炭產業和具有區域優勢的農業、旅遊等非煤產業實現優勢再造和優勢替代。( 2 ) each state of the total switching period has been studied in detail, in which the voltage of block capacitor and current of leakage inductance of main transformer and keeping time of each state have been discussed, then the condition of zero voltage switching is attained, which gives theory guidance for setting reasonable dead time, finally, the possibility of zero voltage switching is proved by simulation of saber software
（ 2 ）對不對稱半橋在一個完整的開關周期內各個狀態分析，描述了隔直電容電壓和變壓器漏感電流的變化規律，各個狀態的持，然後得出實現zvs的條件，從而為設置合理的死區時間提供了理論指導，最後用saber軟體進行了模擬，驗證了零電壓開關實現的可能性。We also analyze the influence of the boundary condition 、 safety distance and deceleration probability to the traffic flow. finally, we propose an crossroad modle. this model is made up of one main road and one branches ： traffic with lights placed on the crossing, vehicles " breaking while running and turning to other direction while jamming. we investigate the velocity and flow of the model when the initial density, the brake and turning probabilities, the green to signal ratio are changed. then the reasons causing all the kinds of phenomena are analyzed
最後研究了周期性邊界條件下的十字路口的ca模型，該模型由一條主幹道和一條支道組成，在幹道與支道的交叉路口設置紅綠燈，車輛在運行中對突發事件發生反應的剎車，路口的車輛可以轉向等各種實際交通行為，並通過計算機模擬，研究模型在改變車輛的初始密度、剎車概率、轉向概率、紅綠燈信號的綠信比等各種情況下支、主幹道車輛的速度、流量的變化，並分析在各種情況下交通狀況的成因，提出改善交通的有效措施。Secondllv in the 1 d random traffic flow model. the relation function between the correlation and the creation. disappearance. brake probabilities of the vehicles is presented. according to the statistical mechanical approach to the spatial correlation functions. the theoretical results agree with that of the computer simulation. thirdh. based on the bml model. a main - road traffic flow model with two speeds on two dimensions is designed. this model simulate the traffic situation of one main road and several branches in the cit traffic lights placed on the crossing. vehicles breaking ~ vhile running and turning to other direction while jamming. we investigate the ~ ' e1ocitv and flo ~ ~ of the model when the initial densitvthe brake and turning probabilities. the green to signal rati3. thc number of the branches and the period of the signal are changed. then the reasons causing all the kinds of phenomena are analvzed. finallv. we simulate the bml model using the method of lattice boltzmann which ~ vas brought out by liu mu - renand obtain the velocity - density graph similar to the previous result. the upper critical densiw above which there are oniv jamming configurations. and the lo ~ ver critical density below which there are only moving configurations are the same as before. the boltzmann function which is on the lattices shows the moving and jaxmning transition obviouslv. thus it proves the possibilit of this method on the traffic research
接著，建立了和研究了二維二速的主幹道模型，該模型模擬了城市交通中一條主幹道，多條支道的交通情況，在幹道與支道的交叉路口設置紅綠燈，車輛在運行中可以有對突發事件發生反應的剎車，在發生堵塞時，路口的車輛可考慮通過轉向來緩解交通等各種實際情況的發生，給出了車輛演化的演化方程，並通過計算機模擬，研究模型在改變車輛的初始密度、剎車概率、轉向概率、支道數、紅綠燈信號的綠信比、紅綠燈信號周期等各種情況下支、主幹道車輛的速度、流量的變化，並分析在各種情況下交通狀況的成因，提出改善交通的有效措施。最後，在劉慕仁提出的用格子boltzmann方法研究一維決定論交通流的思路下，將此法推廣到對二維bml模型的模擬上，得到了與用以往方法的研究結果相類似的速度-密度圖線，且車輛從運動相到堵塞相轉變的上下臨界密度是一致的，同時分別給出車輛在處于暢通相和堵塞相時， boltzmann函數在格子上的分佈情況，進一步驗證了此法的可行性。Numerical resultsdemonstrate the accuracy and the validity of the proposed method for identificationthe parameters of lti system and smoothly, periodically and abruptly time - varyingparameters of ltv system
對線性時不變系統和線性時變系統在參數連續平滑變化、周期變化、突變的情形下進行模擬驗證。In the air combat simulation, since the system runs in the way of time frame cycle, the flying locus of the weapon, such as missile, changes as a dispersing function, and its movement is much faster than the target ( moving or static ) comparatively, so some errors emerge when the collision test is calculated between the weapon and the target
摘要空戰模擬中，由於模擬系統採用時間幀周期方法調控系統的解算，致使導彈等武器的飛行彈道呈離散函數變化，而導彈等武器的飛行相對于靶標（運動或靜止）是一個快速運動，這樣，武器與靶標的碰撞解算就會引出很多誤差問題。The author puts forward the thought of analyzing bifurcation and chaos in dc / dc converters with the theories of nonlinear dynamics, and the thought of controlling nonlinear problems with linear controlling methods of modern control theory. chapter three ( research on bifurcation and chaos in pwm dc / dc converters ) first theoretically analyzes and emulates period - doubling bifurcation of pwm dc / dc converters with the " inverse " piecewise numerical emulation. then the author analyzes in detail the sampled - data model, the mathematical model, which is suitable to the nonlinear research of dc / dc converters
第三章（ pwm型dc dc變換器中分岔與混沌的研究）首先採用「逆向」分段數值模擬法對pwm型dc dc變換器中的倍周期分岔進行了理論分析與數值模擬；接著詳細地分析了適合於dc dc變換器非線性研究的數學模型一采樣數據模型，提出了dc dc變換器中存在環面分岔與鞍結分岔的可能性；最後通過電路實驗驗證了在電路參數發生變化時， dc dc變換器經歷一系列的倍周期分岔通向混沌的演化過程，並對混沌態下dc dc變換器的輸出特性進行了分析與小結。Through calculation on varied parameter, a group of suitable parameter is found out. the results of experiments indicate that the theoretical analysis to the magnetic field of the magnetic structure is proper. to remove the result error come from the change of gap between piston rod and sensor, a signal processing method accompanied with machine learning process is researched
為消除傳感器與磁性標尺之間間隙變化對測量結果的干擾，將示教學習方法引入行程傳感液壓缸的信號處理過程，並使用改進的遺傳演算法解決自學習過程中周期曲線的擬合問題，提出了雙傳感器軸向直線布置方法和基於自學習過程的信號處理方法，通過實驗，達到了顯示精度0 . 01mm ，測量重復精度0 . 2mm的良好效果。Full quanta theory was used in analysis the working principle of laser, educed the photon states of single pattern radiate in two energy - step system, and simulated the establishment of laser mode and statistical distribute of photon. according to elf consistent equations of rlg ; build the simulated program with labwindows / cvi and do some simulation experiments, the result of simulation matched the theory perfect perfectly and conform to the experiments, the locked - in and pattern competition coursed the periodic light intensity
在激光陀螺自洽場方程組的基礎上，運用labwindows / cvi軟體建立了靈活方便的激光陀螺模擬平臺，並進行模擬試驗，模擬試驗結果與理論分析很好的相符合，且能夠較好地說明陀螺試驗現象，即在閉鎖閾值附近，由於閉鎖效應和模競爭相互影響，使得激光腔中兩行波相互關聯，光強差隨時間呈周期性變化。It is constructed that radial impact and rubbing dynamics differential equations of the rotor system having the nonlinear rigidity on the unsteady and non - linear oil film. the bifurcation and chaos behavior of impact and rubbing fault rotor system caused by the parameters of nonlinear rigidity, rotor rotating speed, eccentric mass is analyzed, in the numerical value analysis method. the bifurcation diagrams, maximum lyapunov exponent diagrams, poincar maps, phase plane portraits, trajectories of journal center, time - history curve, amplitude spectra diagrams of the rotor motion are used
（ 2 ）建立了具有非線性剛度的轉子系統在非穩態非線性油膜力作用下的徑向碰摩動力學微分方程，並應用含高階余項的非線性動力方程的線性化數值法研究了此類系統響應的復雜動力學行為，利用轉子響應的分岔圖、最大lyapunov指數曲線、 poincar截面映射、時域波形、相軌線、軸心軌跡、幅值譜等圖形分析了系統響應的周期運動、擬周期運動、倍周期分岔、混沌等運動形式的轉化與演變過程，重點研究了非線性剛度、轉子轉速、偏心質量等系統參數對碰摩故障轉子系統的分岔和混沌行為的影響。Modeling of mechanics multibody system is the primary sustaning technology of virtual prototype. it is the base of virtual prototype to realize simulation. design and control. the technology of virtual prototype has changed the tradisional design based on physical prototype, and has greatly reduced the expensive and time wasting manufactrue and exprements of physical proto type. it allows the users analyse and compare rared of designe plans fastly. it can realize optimized design, and can find the potential questions in the early design. it is the effective method to improve qualities of products, to shorten the developing cycle, and to reduce the developing cost
機械多體系統動力學建模是虛擬樣機的主要支持技術之一，它是虛擬樣機實現模擬、設計製造和控制運行的基礎。虛擬樣機技術改變了傳統以物理樣機為基礎的設計，大大減少了昂貴而費時的物理樣機製造及試驗過程，使用戶可以直接在計算機上快速分析比較多種設計方案，進行優化設計，在設計的早期及時發現潛在的問題，是提高產品質量、縮短產品開發周期，降低產品開發成本的有效途徑。分享友人